Install the transfer box (ATC 13-1)

• Apply a thin coat of grease to the gearing (1)  in the transfer box (VTG) and the gearing (2)  on the automatic transmission.
  CONSUMABLE SPECIFICATION
  
  

  Ball bearing grease

  100 g, Tube

  81229407174

  Courtesy of BMW OF NORTH AMERICA, INC.

• Before installing the front prop shaft in the transfer box (VTG), replace the O-ring (1)  .

  Parts:  O-ring

• Apply a thin coat of grease to the gearing of the output flange in the transfer box (VTG).
  CONSUMABLE SPECIFICATION
  
  

  Ball bearing grease

  100 g, Tube

  81229407174

  Courtesy of BMW OF NORTH AMERICA, INC.

• Position the transfer box (VTG) with a helper.
• Position the front prop shaft (1)  on the output flange (3)  of the transfer box (VTG).
• Match the front prop shaft (1)  with the marks (2)  and (4)  .
• Install the transfer box and slide the front prop shaft (1)  into the output flange (3)  of the transfer box (VTG) in the arrow direction at the same time.
• Remove any grease that has emerged at the prop shaft after the installation.

  Courtesy of BMW OF NORTH AMERICA, INC.

  NOTE: TECHNICAL INFORMATION 
  When assembling, it is essential to observe screwing sequences and tightening torques.
  Failure to comply with the regulations can lead to leaks and damage.
• Tighten the screws in order from (1)  to (5)  (arrows).
  TIGHTENING TORQUE SPECIFICATIONS
  
  

  Transfer box to automatic transmission
  M10	tightening torque	43 Nm

  Fig 1: Transfer Box Screws Tightening Sequence

  Courtesy of BMW OF NORTH AMERICA, INC.
• Connect connector (1)  from transfer box control unit (longitudinal torque distribution) (2)  .

  Courtesy of BMW OF NORTH AMERICA, INC.

• Install the ground strap (2)  .
• Tighten down screw (1)  .

Courtesy of BMW OF NORTH AMERICA, INC.

Follow-up work 

• Refer to CHECKING/TOPPING UP THE TRANSFER BOX OIL (ACTIVE TORQUE CONTROL 13-1) .
• Refer to CONNECTING ALL BATTERY GROUND LEADS .
• Refer to INSTALLING THE RUBBER MOUNT FOR THE TRANSMISSION BEARING (ALL-WHEEL DRIVE) .
• Refer to FASTENING THE PROP SHAFT (PARTIALLY REMOVED) .
• Refer to INSTALLING THE RETAINING PLATES .
• Refer to INSTALLING TRANSMISSION CROSS MEMBER .
• Refer to INSTALLING THE HEAT SHIELDS .
• Refer to INSTALLING EXHAUST SYSTEM .
• Refer to INSTALLING THE CONNECTING SUPPORTS ON THE TUNNEL .
• Refer to INSTALLING BOTH TRIM PIECES FOR THE EXHAUST TAILPIPE .
• Refer to INSTALLING THE TRIM ON THE REAR BUMPER PANEL .
• Refer to INSTALLING THE REAR DIFFUSER .
• Refer to INSTALLING THE UNDERBODY PLANKING OF THE TRANSMISSION ON THE SIDE .
• Refer to INSTALLING REAR UNDERBODY PROTECTION .